408?
Thread Starter
Staging Lane
Joined: Nov 2011
Posts: 56
Likes: 0
From: Katy, Texas
408? Well, after being one of the people screwed by Kentucky Turbo for well over 20k, I'm finally getting all my parts assembled to finish my car. I have a fully forged 408 with all the good stuff. But, the problem is, that everyone keeps telling me I should have built a 370 or similar sized motor due to skirt clearances. So, I guess the question is, should I sell the 408 and build a 370-375 or keep the 408. 2900lbs, built T56.
Keep the 408 and match the proper turbo to it and it will do whatever you want it to do.
A GT5088, GT5288 and a GT5588 are all great choices for a 408 c.i. LS motor.
As 72camaro said, the right cam can bring the turbo online quickly at a low RPM and have it hold power to redline without tapering off.
A GT5088, GT5288 and a GT5588 are all great choices for a 408 c.i. LS motor.
As 72camaro said, the right cam can bring the turbo online quickly at a low RPM and have it hold power to redline without tapering off.
Trending Topics
Thread Starter
Staging Lane
Joined: Nov 2011
Posts: 56
Likes: 0
From: Katy, Texas
Hey Josh! It's been awhile bud. I picked up LS9 heads, Tooley springs, pushrods, LS3 intake, possibly working on the LS3 Victor intake and a 4150 TB. I still have that K member for u, I got another. Upper and lower contol arms, and I'm seeing Madman next week to start my cage and rebuilding the front.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
Staging Lane
Joined: Nov 2011
Posts: 56
Likes: 0
From: Katy, Texas
Martin, I'll definitely be getting a cam from you within the next couple of weeks. I'll have my engine builder call you this week. As far as turbos go, my buddy talked me into a BW S480 with .96
Keep the 408 and match the proper turbo to it and it will do whatever you want it to do.
A GT5088, GT5288 and a GT5588 are all great choices for a 408 c.i. LS motor.
As 72camaro said, the right cam can bring the turbo online quickly at a low RPM and have it hold power to redline without tapering off.
A GT5088, GT5288 and a GT5588 are all great choices for a 408 c.i. LS motor.
As 72camaro said, the right cam can bring the turbo online quickly at a low RPM and have it hold power to redline without tapering off.
Keep the 408 and match the proper turbo to it and it will do whatever you want it to do.
A GT5088, GT5288 and a GT5588 are all great choices for a 408 c.i. LS motor.
As 72camaro said, the right cam can bring the turbo online quickly at a low RPM and have it hold power to redline without tapering off.
A GT5088, GT5288 and a GT5588 are all great choices for a 408 c.i. LS motor.
As 72camaro said, the right cam can bring the turbo online quickly at a low RPM and have it hold power to redline without tapering off.
Hey Josh! It's been awhile bud. I picked up LS9 heads, Tooley springs, pushrods, LS3 intake, possibly working on the LS3 Victor intake and a 4150 TB. I still have that K member for u, I got another. Upper and lower contol arms, and I'm seeing Madman next week to start my cage and rebuilding the front.
Art, I think the s480 is kind of small for a 408. I think Martin will agree. It will leave a lot to be desired. A better match would be a gt 5594, or even the gt91 like what is on my car. The 80mm compressor wheel can't compare to an 88, or 91 and up. The 5594 has a 94 compressor that will move a lot of air through that motor.
Thread Starter
Staging Lane
Joined: Nov 2011
Posts: 56
Likes: 0
From: Katy, Texas
He's cutting that Crap of a cage that was put in, doing a chromemoly 8 point and setting up the front end for the intercooler and radiator. Welding in some subframes and not tubbing it ...yet :-)
Martin, I will be getting with you soon for a camshaft. I think thats the only thing thats left on my car. I think its a brutespeed blower cam and think that its not optimized to my setup. I will be getting with you soon for a custom grind to hopefully maximize my setup.
Nice Art, what all is he doing to it? I am going to be moving hopefully by the summer and have a bigger garage. I am going to fab a turbo kit for Sylvio's car and will have more room than my current setup.
Nice Art, what all is he doing to it? I am going to be moving hopefully by the summer and have a bigger garage. I am going to fab a turbo kit for Sylvio's car and will have more room than my current setup.
Thanks for the info 
We can attempt to offset the added airflow requirement with a smaller cam and cylinder head(intake runner and intake valve), but ultimately the easiest thing to do is utilize the right compressor wheel.
Martin, I will be getting with you soon for a camshaft. I think thats the only thing thats left on my car. I think its a brutespeed blower cam and think that its not optimized to my setup. I will be getting with you soon for a custom grind to hopefully maximize my setup.
We can definitely optimize your set-up with a good turbo grind.
Nice Art, what all is he doing to it? I am going to be moving hopefully by the summer and have a bigger garage. I am going to fab a turbo kit for Sylvio's car and will have more room than my current setup.
We can definitely optimize your set-up with a good turbo grind.
Nice Art, what all is he doing to it? I am going to be moving hopefully by the summer and have a bigger garage. I am going to fab a turbo kit for Sylvio's car and will have more room than my current setup.
Is there a compressor map available for your turbocharger?
Art, I think the s480 is kind of small for a 408. I think Martin will agree. It will leave a lot to be desired. A better match would be a gt 5594, or even the gt91 like what is on my car. The 80mm compressor wheel can't compare to an 88, or 91 and up. The 5594 has a 94 compressor that will move a lot of air through that motor.
I would highly recommend purchasing the billet wheel S480 that Forced Induction offers if you stay with a S480 based turbo. The compressor map on a S480 IMO is not broad enough at lower pressure ratios(where your 408 will end up on the map) to move the airflow requirement your engine will demand efficiently.
We can attempt to offset the added airflow requirement with a smaller cam and cylinder head(intake runner and intake valve), but ultimately the easiest thing to do is utilize the right compressor wheel.
Give me a call or shoot me an email(would be best so I can send you a spec sheet) and if we can we'll plot out some numbers and see where you're at with your current combination.
Is there a compressor map available for your turbocharger?
Agreed 100%. The turbo's you mentioned are also much more efficient in moving higher amounts of airflow at lower pressure ratios. A larger c.i. motor will not generate the manifold pressure a smaller motor will.
We can attempt to offset the added airflow requirement with a smaller cam and cylinder head(intake runner and intake valve), but ultimately the easiest thing to do is utilize the right compressor wheel.
Give me a call or shoot me an email(would be best so I can send you a spec sheet) and if we can we'll plot out some numbers and see where you're at with your current combination.
Is there a compressor map available for your turbocharger?
Agreed 100%. The turbo's you mentioned are also much more efficient in moving higher amounts of airflow at lower pressure ratios. A larger c.i. motor will not generate the manifold pressure a smaller motor will.
I will look through my emails and see what I can find!
That said, I believe most of those cams will either be too large, or won't have the correct valve events needed for your application.
That said, I believe most of those cams will either be too large, or won't have the correct valve events needed for your application.
